Have kernel build rule create kernel.sym, which can be
used in Bochs to make breakpoint setting easier:

	load-symbols "kernel.sym"
	vb 0x8:"main0"
	c
	disasm/25 "main0"
	vb 0x8:"main0"+0x5f
	c

etc.

fix toc example

guaranteed.

cut last line of readme so that readme fits on single page